Method of making a buffing wheel or wheel section and the product thereof



E. W. HALL July l1, 1939.

METHOD OF MAKING A BUFFING WHEEL OR WHEEL SECTION AND THE PRODUCT THEEEOF Filed Sept. 16, 1937 3 Sheets-Sheet 1 IN VEN T OR Eli ha W Hall AI'TOHNEYS BY M hat JM,

July 1l, 1939. E. w. HALL 2,165,752

METHOD OF MAKING A BUFFING WHEEL OR WHEEL SECTION AND THE PRODUCT THEREOF Filed Sept. 16, 1937 3 Sheets-Sheet 2 INVENTOR 4Elisha W Hall ATT ORNE YS July 11, 1939. E. w. HALL 2,165,752v

METHOD OF MAKING A BUFFING WHEEL OR WHEEL SECTION AND THE PRODUCT THEREOF Filed Sept. 16, 1937 3 Sheets-Sheet 5 IN VEN TOR Elisha' m Hall ATTORNEYS Patented July 11, 1939 UNITED ATENT OFFICE 2,165,752 y METHOD F MAKING A BUFFING WHEEL 0R WHEEL SECTION THEREOF AND THE PRODUCT lil Claims.

This invention relates to a novel and improved method of making a hurling or polishing wheel or wheel section and the product thereof. Heretoiore, in the manufacture ci a buing or pol ii ishing wheel or wheel section, ii a strip oi bumng or polishing material such as cloth be wound about a hub to the thickness required at the periphery of the wheel, the thickness ci such material is s'o much greater than that of the hub that dimculty is experienced in preventing the cloth from overlapping the outer margin oi the hub. 0n the other hand, ii the hub be made thicker', then it prevents obtaining the proper density oi the cloth when clamping a Wheel or a number of wheel sections onto an arbor.

in accordance with the present invention, these dimculties are avoided by employing a hub which is readily compressible in an axial direction and which has an initial thickness approximating what is to be the aggregate thickness of the bufng or polishing material. The latter may then be applied to the hub without danger of its overlapping the hub, anchor disks applied to the faces of the hub and bnmng or polishing material, the parts being united as by ,adhesive, and the assembly then compressed under great pressure which reduces the thickness of the hub to that required for use,4 and when the pressure is removed, the hub remains permanently compressed, while the unrestrained part of the cloth, being resilient?, expands to the thickness required at the periphery. Thus, the hub presents no obstacle to obtaining the pressure on the cloth, necessary to providevthc proper density of the latter when clamping the wheel or wheel section on an arbor. be secured on the one handto the cloth and on the other hand to the hub by stitching. Thus there is produced a wheel or wheel section having a desirably thin hub and a desirably thicker working face, so that the hub will not interfere with the proper clamping by clamping disks onto an arbor.

iii

The invention will best be understood by ref- 55 Fig. 2 is an edge elevation of the same;

The anchor disks may desirably Fig. 3 is a side elevation oi one of the collapsible disks, oi which the hub is to be constituted;

Fig. fi is an edge elevation of the same Fig. 5 is an elevation ci a portion ci the biasn cut strip of warp and Woof cloth which is to a constitute the bumngv or polishing material;

Fig. 6 is a side elevation of the strip of cloth ruined to reduce the length oi one ci its edges preparatory to assembly with the hub; Fig. 'l is an edge elevation ci" the red margin lo ci the cloth strip;

Fig. 8 is a vertical, sectional view illustrating steps in the assembling and uniting of parts;

liig. 9 is a sectional view oi the complete assembly in readiness to be compressed; and

Fig. l0 is a sectional view of the assembly after the pressure has been removed.

Referring to the drawings and to the method and the product of the method illustrated therein, and having reference at first to Fig. 5, there is shown a strip li of appropriate cloth such as canton flannel, twill, duck, or sheeting, the material shown being bias-cut, warp and woof cloth.

As shown, there is employed a single layer of cloth, although in some cases it may be desirable to employ a plurality of superposed plies.

, The rst step is to shorten the strip along one edge by ruilling the same for example as shown in Fig. 6, and securing the rullles as by one or more, herein two, rows i3 and I5 of 30 stitches. This may conveniently be accomplished by the use of a two-needle sewing machine equipped with a ruining attachment.

The next step or steps may be Varied somewhat, as desired. A hub Il may be prepared first, and then assembled with the ruilled strip and the anchor disks, but a convenient mode of assembly, and the one which it is preferred to employ is, rst to take an anchor disk I!! of suitable material such as sheeting, twill. or canvas provided with a small, central hole 2l, place it over a centering or pilot pin 23 upon a turntable 25, and apply adhesive such as latex to the upper face of the disk as by a spray nozzle 21. The previously prepared hub as an entirety may now be placed on and about the centering pin and superimposed upon the tacky surface of the anchor disk, but a more convenient way, and the one which it is preferred to employ, is to build up the hub upon the pin.

A desirable hub, and the one which it is preferred to employ, is composed of a plurality of plies or sheets, herein three sheets 29, of corrugated cardboard, each with a central hole 3|. Ordinary, commercially obtainable, corrugated cardboard is desirably employed, and comprises two outer, flat sheets 33 and an intermediate,

corrugated sheet 35, all of which are adhesively united. This material is readily compressible or collapsible under suflicient pressure because oi its cellular characteristic.

According to the preferred mode of assembly, one of these disks is placed upon and about the centering pin and is superimposed upon the tacky, upper surface of the anchor disk. The upper surface of this corrugated cardboard disk is then coated with adhesive as by spraying it with latex, a second, corrugated cardboard disk is placed upon the tacky upper surface of the first, the upper surface oi the second is sprayed with latex, and a third is then placed upon the second. The upper surface of the third disk may now be sprayed with latex but it is perhaps more desirable to do so later.

The hub is now complete and in readiness for the assembly therewith of the ruilled strip. A convenient mode of applying the strip, and the one which is employed in the present example is to place the free end of the strip upon the tacky, exposed margin of the anchor disk and secure it as by a thin clamp, if need be, and to rotate the turntable, meanwhile coiling the strip helically about the hub with the ruilied margin of the strip toward the hub. During the coiling, the successive convolutions of the strip, close to the hub, and the periphery of the hub are sprayed with latex so that the convolutions adhere to one another and to the hub. When the coiling of the strip has proceeded to a point where the strip has been built up to a thickness approximating that of the hub, the strip is severed preferably at a point in line with the first end.

The upper surface of the upper, carboard disk is now sprayed with latex, or alternatively a second, anchor disk 31 (see Fig. 9) provided with a central hole 33 is sprayed with latex and placed, with its tacky surface downwardly upon the top of the uppermost, corrugated cardboard disk. 'I'he assembly is now complete and may be removed from the centering pin and turntable and placed in a powerful press under a pressure of several tons which compresses the assembly and collapses the hub to the i'lnal thickness which it is to have. The pressure may be so great that the cells of the corrugated cardboard are utterly and completely collapsed so that they cannot be seen except upon close inspection, although, usually, it is practically impossible to distinguish any cellular appearance at all. This is simply a matter of the extent to which the compression is carried.

When the assembly is removed from the press, it is found that while the hub remains compressed and collapsed to the desired-thickness, the cloth strip and the margins of the anchor disks, being resilient, spring out, more especially at the periphery (see Fig. 10) to the dimension required for the working surface of the "'wheel or wheel section.

'I'he parts are now strongly united by adhesive between the anchor disks, and the hub, and the coiled strip, and between the latter and the periphery of the hub, and between the constituent layers of the hub. Furthermore, the wheel or wheel section, except at its marginal portion, possenses a desirable degree of rigidity. It is possible that, under some circumstances, without further fastening, the wheel or wheel section might possess sumcient strength for use, but I prefer to add strength by sewing the margins of the anchor disks to the coiled striplby a row of through and through stitches Il, and further sewing the anchor disks to the hub by a row of through and through stitches 43 (see Fig. 1),.

All that now remains is to punch a central hole of the required shape and dimensions and to trim the margin of the wheel or wheel section true. In the present example, a large, square hole 45 is punched and the wheel or wheel section is placed upon a square arbor, after which the periphery is suitably trimmed smooth and concentric with the axis of the arbor. The wheel or wheel section is now complete and ready for use either alone or in combination with one or more like sections upon the arbor of an appropriate machine.

Having thus described the method of making a wheel or wheel section and the product thereof, what I claim, and desire by Letters Patent to secure is:

1. The method of making a buifing or polishing wheel or section, which comprises assembling about a readily compressible hub, buflng or polishing material having a thickness approximating the thickness of said hub, and assembling with said hub and with said material two anchoring disks, one on each face of said hub and overlapping said material, compressing the entire mass axially, thus permanently reducing the axial thickness of the hub, and then releasing the pressure and allowing the buing or polishing material to expand to an axial thickness greater than that of the hub.

2. The method of making a builing or polishing wheel or wheel section, which comprises assembling and adhesively securing together the following elements, namely a readily compressible hub, buiiing or polishing material about said hub, and two anchoring disks, one on each face of said hub and overlapping said material, compressing the mass axially, thus permanently reducing the axial dimension of the hub, and then removing the pressure and allowing the buiiing or polishing material to expand to an axial dimension greater than that of the hub.

3. The method of making a bufling or polishing wheel or wheel section, which comprises helically winding a strip of bufiing or polishing material about a readily compressible hub, adhesively uniting said material with said hub, adhesively uniting two anchor disks with opposite faces of said hub, compressing the mass axially, thus permanently reducing the axial dimension of the hub, and then removing the pressure and allowing the bufiing or polishing material to expand to an axial dimension greater than that of the hub.

4. The method of making a bumng or polishing wheel or wheel section, which comprises milling a strip of buiiing or polishing material along one edge, winding the strip about a readily compressible hub with the ruiiled edge adjacent the hub, adhesively uniting the ruiiled edge with the hub, adhesively uniting two anchor disks with opposite faces of the hub, compressing the mass axially, thus permanently reducing the axial dimension of the hub, and then removing the pressure and allowing the buning or polishing material to expand to an axial dimension greater than that of the hub.

5. The method of making a bufllng or polishing wheel or wheel section, which comprises ruffiing a strip of buillng or polishing material along one edge, helically coiling the strip about a readily compressible hub with the milled edge adjacent the hub, adhesively uniting the ruilled edge with the hub, adhesively uniting two anchor disks with opposite faces of the hub, compressing the mass axially, thus permanently reducing the axial dimension of the hub, and then removing the pressure and allowing the bun'g or polishing material to expand to an axial dimension greater than that of the hub.

6. In a buffing or polishing wheel or wheel section, the combination of an axially collapsed, cellular hub, a body of bufilng or polishing material about and adhesively united with said hub, and two anchor disks adhesively united with said hub and overlying and united with said buiiing or polishing material.

'7. In a bufling or polishing wheel or wheel section, the combination of a hub comprising a plurality of thicknesses axially collapsed, corrugated cardboard, a body of builing or polishing material about and adhesively united with said hub, and two anchor disks adhesively united with said hub and overlying and united with said buing or polishing material.

8. A builing or polishing wheel hub comprising a plurality of superposed, adhesively united sheets of corrugated cardboard having a common, central opening.

9. In a buiiing or polishing Wheel or wheel section, the combination of an axially collapsed, cellular hub, and an annular body of bumng or polishing material about and secured to said hub.

10. In a. bufilng or polishing wheel or wheel section, the combination of an axially collapsed, cellular hub, and an annular body of buillng or polishing material comprising a plurality of layers adhesively securedto one another and to said hub. Y

ELISHA W. HALL. 

